Sewing-machine.



' Patented May 18,1909.

8 BHBETE-BHBBT 1,

THE NORRIS r'E-rsns co umsumcron, n. c.

V. SANDAHL.

SEWING MACHINE.

APPLICATION FILED SEPT. 28, 1907,

Patented May 18, 1909.

- BSHEBTB-SBEET 2.

V. SANDAHL.

SEWING MAGHINE.

APPLICATION FILED SEPT. 28, 1907.

Patented May 18, 1909. 3 SHEETS-SHEET 3..

1n: NORRIS PEfERS ca., mlsnmamn, a c4 "UNTTED STATS ATN OFFTQE.

VICTOR SANDAHL, OF NEW YORK, N; Y., ASSIGNOR TO L. WHEELER BEECHER, OFNEW HAVEN, CONNECTICUT.

SEWING-MACHINE.

Specification of Letters Patent.

Application filed September 28, 1907.

Patented May 18, 1909.

Serial No. 395,039.

To all whom it may concern.-

Be it known that I, VIcroR SANDAHL, a citizen of the United States,residing at New York, borough of Brooklyn, in the county of Kings andState of New York, have invented a new and useful Improvement in Sewing-Machines; and I do hereby declare the following, when taken inconnection with the ac companying drawings and the numerals of referencemarked thereon, to be a full, clear, and exact description of the same,and which said drawings constitute part of this specification, andrepresent, in

Figure 1 a front view of a sewing machine constructed in accordance withmy invention. Fig. 2 a top or plan view of the same. Fig. 3 a side view,a portion of the frame broken away.

This invention relates to an improvement in sewing machines, andparticularly to machines for stitching outer soles of boots and shoes towelts, the form of the machine being known as loclvstitch, andcomprising a needle and shuttle mechanism, the special object of theinvention being to improve the thread controlling mechanism so that themachine is automaticallyadapted to stitch soles of varying thickness;and the invention consists in the construction and combina tions ofparts as will be hereinafter described and particularly recited in theclaims.

As in the usual construction of machines of this class the main shaft 2is mounted in uprights 3 springing from a base 4 the shaft being driventhrough the usual driving Wheel 5. The shuttle carrier 6 is of usualconstruction mounted in a housing 7 and rotated by a rack 8 themechanism for driving this shuttle and moving the needle 9 and awl 47being those of usual construction, and not requiring furtherdescription, the parts all being moved through various racks and camsoperating by the driving shaft 2. The work is placed between a support10 and a presser foot 11. This presser foot mounted u on a pivot 12 hasa tail 13 to which is attac ed a presser foot connecting rod 14 whichextends rearward and is pivotally connected with a thread-measuringadjusting lever 15, this lever being mounted to turn upon a shaft 16,the thread 17 coming over the needle, passes over the usual take-upmechanism and extending rearward passes around a guide roller 40 in theend of the lever 18, thence over a guide 19 and rearward between thethread clamp 20 and a roller 21 on a shaft 22, the thread clamp beingcarried. by an arm 41 which extends around the frame and is mounted on abearing 42 and is turned by an arm 43 which extends into engagement witha cam 44 whereby the thread may be held at this point when the stitch ismade. The thread measuring lever 18 is mounted upon and fixed to a shaft23 and carries a roller 24 which is engaged by a cam 25 whereby thelever is rocked. Mounted upon and fixed to the shaft 23 are a series ofpawls 26 adapted to engage with teeth 27 on the upper end of the threadmeasuring adjusting lever 15.

Mounted u on the shaft 22 is a pawl lifting lever 29 raving a rearwardlyextending arm 30 which is moved by a cam on the driving shaft 2. Thelever 29 is also provided with a downwardly extending arm 31 which isengaged by a spring 32. The upper end of the lever 29 has a transverselyarranged finger 33 by which the pawls 26 are lifted out of engagementwith the teeth 27, these pawls being held downward by means of springs34 which are connected With a stationary bar 35. The arm 30 of thepawllifting lever is provided with a tail-piece 36 which is connected bya spiral spring 37 with a lug 33 on the lower end of the threadmeasuring adjusting lever 15 so as to normally depress the presser-foot.The spring 3'7 is lighter than the spring 32 so that the pressure of thespring 32 will overcome the pressure of the spring 37 on the lever 30.The spring 37 is so arranged that the tension of the spring varies withthe position of the lever 15. The thicker the sole is the more thespring must yield and a heavier tension will be imparted to the presserfoot. The spring 37 is also placed between the levers 15 and 30 so thatthe tension of the spring will be increased and decreased by themovement of the lever 30, the greatest tension being applied when thelever is operated b its cam to permit the pawls to engage the liever 15which are timed to do so just after the stock has come to rest before astitch is made. When the pawls are raised by the lever just before thefeeding of the stock, the spring is shortened and a lesser pressure isapplied to the resser foot. B this arrangement it wil be seen that alight pres sure is on the sole when fed along and a heavierpressure-isappliedafter the sole'has come to rest and the presser footwill be lockedwith he avier pressures on: the-sole.

In the lower end of the thread-measuring: lever 18 is a stop screw39which bears against the thread-measuring adjusting lever= 1'5at theinward stroke of the lever. The threadentering ,theem'achinez-irom thespool.=.passin:g. between the roller 21 and clamp 20 overthe guide 19and around the guide roll tO' at the end ofthe thread-measuring lever18, thence forward' to" the needle heneath the clamp 45 1 by" which itis held' against the grooved thread wheel 46, the: tension of" thethread beyond this point being o't usual' construe tion: The clamp 45?is carried by a bell crank'lever" LS'adaptedtobe turned by a cam .on themain shaft: Atapredetermined time the thread is held byxthesclamp 45 andthe" lever" 18" is turned by its cam' so as to throw its lower endcarrying the roller 40' rearward which in turn" draws the threadheneathtthei threadclamp '20 from the spool. The thickness of the. soledetermines the length ofithread :to be drawn from the spool. The. soleis" placed 1 onthe support and the presser-foot' restsupon it, and asthe thicknesses'otthesolesvary the presser -ioot is raised" and.lowered. accordin ly: As the priesserfootzis raisedlor'lowere the lever15 will hemovedaccordingly by the connecting rod 14. Before a" stitch istakentheawlia'i" punches the'sole and-the resser-foot is held so as nottobe lifted b'y the awlb'ytlieene gagement. of the pawls 26 :with-theteeth 27; Afterrtlie' awlhas punched the' hole and before it iswithdrawn, the pawl 26 will be lifted out. of engagement with the teeth27'' so that the lever'15'is free to turn, and'so as topermit' thefeeding'ot the soleby the awl iii-the usual way. At the timet'hestitchis taken the threadfrom the spoolis-held by the clamp 20and itthe sole'increases'in' thick 'ness' more thread is" required; and athicker sole raises the presser-foot which draws the connecting" rod" 14moving the lever;15" forward,' and 'ifthe' lever-r15 moves iorwarditallows. the lower end ofthe' threadmeasuring lever" 18 to swingforwardto a greater-extentbeforethe stop screw 39 engages: with the lever15 sothat when it returns a greater lengthof thread will he drawn from the"spool. The de th to which the thread "is pulled into these e may beadjusted bythe stop'screw '39: Atthe time the drawingofthe" thread fromthe spooltakes place, the thread clamp 20"is raisedland the clamp 45brought into action to holdthe'threadf Onthe'other hand, a thinnersolemoves the connecting ro d. 14 rearward "and hence moves the threadmeasuring adjusting? lever 15" rearwar'dso that thestop screw 39 in thelever'18 will strike the lever 15 at" an earlier point .inithe operationofthe' machine" so that its return movement is not so" great, and

I therefore aless amount otthreadis drawn.- The spring 32 holds the camroll carried by' 1t?1S stronger than the spring 37 it overcomes theinfluence of the spring 37 on the arm 30. IfIthinne-r stock is beingsewed the lever 15 will be turned rearward to a greater extenttherebydiminishing the tension on the spring 37 and thence the. pressureof the presserfoot; on the other hand, thicker stock turns the lever 15forward, increases the tension pressure at the presser-loot I claim:'

1. In a sewing-machine, the comhination j w th a presser'foot, ofa'spring appl-ylng ten- S1OIIJDO the presser foot, mechamsmto lock with:said mechanism and operated 5 thereby,

varied, substantially asdescribed.

ingrea-rward therefrom,- a thread measuring ad ustinglever connectedwith the connect teeth, athread measuring lever, pawlsopersaidt'eeth,and means for lifting said pawls out of engagement with said teeth.

adjusting lever conncctedfw-ith theconnectteeth, a thread measuringlever, pawls adapted'to-be'moved thereby and adaptedto be the sole.

wit'hatpresser foot, a connecting rodextend- I ingrearward therefrom, athread-measuring l adjusting lever connected with the connect-"- ing.rod and .provided'at its upper-endwith with the thread measuringadjusting lever, pawls adapted to be moved by said thread leverconnected with said connecting rod and formed at its uppenend'withteeth, a thread-measuring lever carrying'an adjustingscrewat its lowerend for-engagement the arm'30. in contact with its cam, and asof thespring 37' and'hence increasing theandunloch the presser-toot inrelationto the feedmg of thestock, said spring connected whereby thetension otthe presser' foot 18" 2. In a sewingmachine, thecombinationw1th.a presser foot, aconnecting rod extend ing rod,-provided at. its upper end with ated thereby and adapted to beengagedwith 3. In a sewing: machine, the combination with a presserioot,a connecting rod extend-- ing rearward therefrom, a thread 5 measuringingrod, provided at its upper end with.

engaged*with said teeth, a spring attached to the said thread adjustinglever, and means for automatically adjusting the tensionof thespringiwith relationto. the thickness of 4; In a sewing machine,the-combination teeth, a thread measuring: lever cooperatingmeasuringlever and to engage with said; teeth, aspring attached to saidthread measuring ad usting lever, and means for therefrom, a threadmeasuring adjusting" with said measuring adjusting lever, pawls moved bysaid thread measuring lever and adapted to engage with said teeth, apawllifting lever having a forwardly extending arm and a downwardlyextending arm, springs connected with said arms, and cams for movingsaid levers, substantially as described.

6. In a sewing machine, the combination with a presser foot, aconnecting rod extending rearward therefrom, a thread measuringadjusting lever connected with the connecting rod, provided at its upperend with teeth, pawls adapted to be engaged with said teeth, means forlifting said pawls out of engagement with said teeth, and a threadmeasuring lever cooperating with the thread measuring adjusting lever,substantially as described.

7. In a sewing machine, the combination with a presser foot, aconnecting rod extending rearward therefrom, a thread measuringadjusting lever connected with the connecting rod, provided at its upperend with teeth, pawls adapted to be engaged with said teeth, a springattached to the said thread adjusting lever, means for automaticallyadjusting the tension of the spring with relation to the thickness ofthe sole, a thread measuring lever cooperating with the thread measuringadjusting lever, and an adjustable stop screw mounted in said threadmeasuring lever, substantially as described.

In testimony whereof, I have signed this specification in the presenceof two subscrib- A ing witnesses.

VICTOR SANDAHL. l/Vitnesses:

E. S. BOWERS, LAURA GIBB.

